/*
 * Copyright 2007 Rob Nielsen
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * 	http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.googlecode.proxymatic.core.handlers.method;

import com.googlecode.proxymatic.core.MethodInvoker;
import com.googlecode.proxymatic.core.ReturnTypeModifier;
import com.googlecode.proxymatic.core.RuntimeContext;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class ConstructorMethodInvoker implements MethodInvoker {
    private final Constructor targetConstructor;
    private final ParameterModifier parameterModifier;
    private final ReturnTypeModifier returnTypeModifier;

    public ConstructorMethodInvoker(Constructor targetConstructor) {
        this(targetConstructor, ParameterModifier.NO_MODIFICATIONS, ReturnTypeModifier.NO_MODIFICATIONS);
    }

    public ConstructorMethodInvoker(Constructor targetConstructor, ParameterModifier parameterModifier, ReturnTypeModifier returnTypeModifier) {
        this.targetConstructor = targetConstructor;
        this.parameterModifier = parameterModifier;
        this.returnTypeModifier = returnTypeModifier;
    }

    public Object invoke(Method method, Object[] parameters, RuntimeContext context) throws Throwable {
        try {
            targetConstructor.setAccessible(true);
            Object[] modifiedParameters = parameterModifier.modifyParameters(parameters, method.getParameterTypes(), targetConstructor.getParameterTypes());
            Object o = targetConstructor.newInstance(modifiedParameters);
            return returnTypeModifier.modifyReturnType(method, o, targetConstructor.getDeclaringClass());
        } catch (InvocationTargetException e) {
            throw e.getTargetException();
        }
    }

    public Class[] getExceptionTypes() {
        return targetConstructor.getExceptionTypes();
    }
}
